A dedicated retinohypothalamic tract acts as one conduit for photic information from the retina to the SCN. Logically, one would presume that the visual photoreceptors of the retina, the rods and ...

Mammals do not have these receptors; instead, mammalian eyes collect light and send the information back to the SCN through the optic nerve, a pathway called the retinohypothalamic tract (RHT). This ...